试题与答案

触发导通的晶闸管,当阳极电流减小到低于维持电流时,晶闸管的状态是()(A)继续维持导

题型:单项选择题

题目:

触发导通的晶闸管,当阳极电流减小到低于维持电流时,晶闸管的状态是()

(A)继续维持导通

(B)转为关断

(C)只要阳极-阴极仍有正向电压,管子能继续导通

(D)不能确定

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/0318/04ef39d7f85def94e6dd33eadff8d426.html

下面是错误答案,用来干扰机器的。

参考答案:D解析:传统的成本计算方法下间接成本分配也是分两步进行,但是中间的成本中心是按部门建立的。第一步除了把直接成本追溯到产品之外,还要把不同性质的各种间接费用按部门归集在一起;第二步是以产量为...

试题推荐
题型:选择题

下列有关文学常识的表述错误的一项是[ ]

A.《我的叔叔于勒》选自法国作家莫泊桑的短篇小说集《羊脂球》。

B.胡屠户、夏洛克分别是小说《儒林外史》和《威尼斯商人》中塑造的吝啬鬼形象。

C.朱自清,现代著名作家,其散文代表作有《匆匆》《背影》《春》。

D.《聊斋志异》是一部优秀文言短篇小说集,作者是清代小说家蒲松龄。“聊斋”是他的书屋名,“志”是记述的意思,“异”指奇怪的传闻。

查看答案
题型:阅读理解

阅读下列短文,从每题所给的A、B、C、D四个选项中,选出最佳选项。

           A

Researchers who helped discover a new species of Mexican butterfly are offering to sell the naming rights to raise money to fund more research. Co-discoverer Andrew Warren is hoping to raise at least $50,000 by auctioning(拍卖) off the rights to name the 4-inch “owl eye” butterfly, which lives in Sonora, a Mexican state bordering Arizona.

“That would support at least two years of research for our team down in Mexico,” Warren said. “Money goes a long way down here in Mexico.”

According to the scientific tradition, discoverers of a new species have the say in naming it. In recent years, some discoverers have auctioned off their naming rights to raise money.

Warren said the amount being sought for the butterfly is not out of the question, noting that naming rights for a new monkey species brought in $650,000 two years ago. A group of 10 new fish species that went on the naming auction block at the same time earlier this year brought in a total of $2 million.

The butterfly discovered by Warren and researcher George Austin ranges as far north as Mexico.

The butterfly was actually in a collection, misidentified as an example of another new species, at the McGuire Center for Lepidoptera and Biodiversity at the Florida Museum of National History in Gainesville, said Warren. They soon began the hard process of determining that it was indeed a “new” model of butterfly.

After checking photos and comparing it with other known species, they determined it was a separate species.

小题1:Where did the researchers discover the new species of butterflies?

A.In Sonora.

B.In Mexico state.

C.In a place in US.

D.Near the US-Mexico border.小题2: Why will the researchers sell the naming rights of the butterfly?

A.To raise money for wildlife protection.

B.To raise money for more research.

C.To cause people’s attention to the new discovery.

D.To cover the cost of the research.小题3:When the butterfly was first discovered, people thought ______.

A.it was a new species at once

B.it wasn’t a species of American butterfly

C.it belonged to the monarch branches

D.it belonged to a new species小题4: We can infer from the passage that ______.

A.the new species of butterfly live both in the US and Mexico

B.it took the researchers a lot of efforts to determine the new species of butterfly

C.the researchers are not sure whether they can get the money they want from the auction

D.it is the first time that the new species of butterfly has been found

查看答案
题型:单项选择题

某商店与某运输公司签订了一份运输合同,由运输公司将一批瓷器从唐山运往北京,商店派一名押运员同行。途中停车吃饭,司机与押运员两人喝了一瓶酒,饭后继续上路。由于饮酒及劳累,司机要求押运员代其开车,押运员亦没有推辞。在一个转弯处,由于车速较快,不慎翻车,车上的瓷器全部毁损。对于该瓷器毁损应当由谁承担责任

A.商店承担责任

B.运输公司承担责任

C.商店与运输公司分担责任

D.司机与押运员分担责任

查看答案
微信公众账号搜索答案